Changes in functional status among persons over age sixty-five undergoing total knee arthroplasty

Area of Science:

• Orthopedic Surgery
• Geriatric Medicine
• Rehabilitation Science

Background:

• Osteoarthritis (OA) is a prevalent condition affecting knee function in elderly populations.
• Total knee arthroplasty (TKA) is a common surgical intervention for advanced knee OA.
• Assessing the impact of TKA on physical functional status in older adults is crucial for treatment guidelines.

Purpose of the Study:

• To evaluate the effectiveness of TKA in improving physical functional status.
• To compare functional status changes in TKA recipients versus similar OA patients who did not undergo surgery.
• To analyze TKA's impact on mobility, gross motor function, and activities of daily living (ADL) limitations.

Main Methods:

• Utilized Health Retirement Survey (HRS) and Medicare claims data (1994-2006).
• Employed propensity score matching to create comparable groups of TKA recipients (n=516) and non-recipients (n=1756).
• Assessed functional status using measures of mobility, gross motor function, and ADL limitations.

Main Results:

• TKA significantly improved mobility (ATT=0.315), gross motor function (ATT=0.314), and reduced ADL limitations (ATT=0.174).
• TKA recipients showed relative improvements of 17.5% in mobility, 39.3% in gross motor function, and 46.9% in ADL limitations compared to baseline.
• Propensity score matching ensured robust comparison between surgical and non-surgical groups.

Conclusions:

• Total knee arthroplasty is an effective treatment for improving functional status in elderly patients with knee osteoarthritis.
• The findings support TKA as a beneficial intervention for enhancing quality of life and independence in older adults with OA.